The correct listing and identification of a ship is important to insure that combat
proceeds smoothly and quickly. To this end, a ship listing should be kept in an easy
to read format, and care should be taken that all appropriate information is available.
The listing attempts to provide all information which may possibly be of use
to the players and referee
Just want to highlight that there's no requirement to use the USP at all. Rather, a ship listing that is in a "easy to read format" and "all appropriate information is available".
Unless someone can cite chapter and verse where its against the rules to mount more than one of the same system type. I haven't seen anything like that, but I haven't looked specifically for it.